Zn Es Zn-Sn galvanbevonatok korroziojanak osszehasonlito vizsgalata elektrokemiai impedanciaspektroszkopiai modszerrel

Translated title of the contribution: A comparative corrosion study of zinc and zinc-tin galvanic coatings by method of electrochemical impedance spectroscopy

Laura Sziráki, Zsuzsanna Pilbáth, A. Cziráki

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Corrosion rates of electrodeposited Zn and Zn-Sn (20-30m%) coatings are compared to hot dipped ones and pure Zn is aerated/deaerated 0,5 mol.dm-3 sodium sulphate solution. Results of electrochemical impedance measurements performed on Zn-Sn coating deposited from a slightly acidic bath containing sulphate ions have revealed the merit ot the passivity of this alloy. Corrosion potential of the alloy remains close to that of pure Zn, while a compact non-stoichiometric Zn/ZnO and Sn/SnO/SnO2 layer forms and due to its weakly degenerated n-type semiconductance the rate of the cathodic processes are markedly reduced. From dependence of capacity on electrode potential the electron density in the oxide film (1019-1020 cm-3) was determined. The zinc oxide films are more sensitive to local damage in the presence of sulphate ions. The dark yellow chromate layer on Zn-Sn coating has better corrosion protection than the iridescent yellow chromate layer on Zn coating.

Original languageHungarian
Pages (from-to)43-49
Number of pages7
JournalKorrozios Figyelo
Volume40
Issue number2
Publication statusPublished - 2000

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Tin
Electrochemical impedance spectroscopy
Zinc
Corrosion
Chromates
Coatings
Sulfates
Oxide films
Ions
Zinc Oxide
Sodium sulfate
Corrosion protection
Zinc oxide
Corrosion rate
Carrier concentration
Electrodes

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Zn Es Zn-Sn galvanbevonatok korroziojanak osszehasonlito vizsgalata elektrokemiai impedanciaspektroszkopiai modszerrel. / Sziráki, Laura; Pilbáth, Zsuzsanna; Cziráki, A.

In: Korrozios Figyelo, Vol. 40, No. 2, 2000, p. 43-49.

Research output: Contribution to journalArticle

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AB - Corrosion rates of electrodeposited Zn and Zn-Sn (20-30m%) coatings are compared to hot dipped ones and pure Zn is aerated/deaerated 0,5 mol.dm-3 sodium sulphate solution. Results of electrochemical impedance measurements performed on Zn-Sn coating deposited from a slightly acidic bath containing sulphate ions have revealed the merit ot the passivity of this alloy. Corrosion potential of the alloy remains close to that of pure Zn, while a compact non-stoichiometric Zn/ZnO and Sn/SnO/SnO2 layer forms and due to its weakly degenerated n-type semiconductance the rate of the cathodic processes are markedly reduced. From dependence of capacity on electrode potential the electron density in the oxide film (1019-1020 cm-3) was determined. The zinc oxide films are more sensitive to local damage in the presence of sulphate ions. The dark yellow chromate layer on Zn-Sn coating has better corrosion protection than the iridescent yellow chromate layer on Zn coating.

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